Digital Rights and Agents talking to humans
Googling this throws a lot of debate on this issue of whether the call made to the restaurant for booking was legal or not. I found this article to put forward a lot of ideas for and against this. So it is for us to decide.

But one thing that I fully agree with you, which should be made into a regulation, is human should know that he/she is talking to a bot. This tweet by @traviskorte reasons it out why:

We should make AI sound different from humans for the same reason we put a smelly additive in normally odorless natural gas.